package test;

public abstract class Shape {
?public Shape(){
??System.out.println("形狀信息是：");
?}
?public abstract void area();
?public abstract void perimeter();
}

package test;

public class Rectangle extends Shape {
??? private int ln=0;
??? private int width=0;
??? public Rectangle (int l, int w) {
??? ?this.width = w;
??? ?this.ln = l;
??? ?System.out.println("此長方形長是："+this.ln);
??? ?System.out.println("此長方形寬是："+this.width);
??? }
?@Override
?public void area() {
??// TODO Auto-generated method stub
??????? int ar=ln*width;
??????? System.out.println("此長方形面積是："+ar);
?}

?@Override
?public void perimeter() {
??// TODO Auto-generated method stub
??????? int pe = 2*(ln+width);
??????? System.out.println("此長方形的周長是："+pe);
?}

}

package test;

public class Cricle extends Shape {
?int radius;
?double pi=3.14;
?public Cricle (int r){
??this.radius=r;
??System.out.println("此圓形半徑是："+this.radius);
?}

?@Override
?public void area() {
??// TODO Auto-generated method stub
??????? double ar=pi*radius;
??????? System.out.println("此圓形面積是："+ar);
?}

?@Override
?public void perimeter() {
??// TODO Auto-generated method stub
??????? double pe=2*pi*radius;
??????? System.out.println("圓形周長是:"+pe);
?}

}

package test;
import java.util.Scanner;

public class Inital {

?public static void main(String[] args) {
??// TODO Auto-generated method stub
??????? Scanner input = new Scanner(System.in);
??System.out.println("請輸入你要選擇的形狀：1.圓形 2.長方形");
??????? int num = input.nextInt();
??????? if(num==1){
??????? ?Scanner input2 = new Scanner(System.in);
??????? ?System.out.println("請輸入圓形半徑");
??????? ?int r = input2.nextInt();
??????? ?Cricle cricle = new Cricle(r);
??????? ?cricle.area();
??????? ?cricle.perimeter();
??????? }
??????? else{
??????? ?Scanner input3 = new Scanner(System.in);
??????? ?Scanner input4 = new Scanner(System.in);
??????? ?System.out.println("請輸入長方形的 長和寬");
??????? ?int l = input3.nextInt();
??????? ?int w = input4.nextInt();
??????? ?Rectangle rectangle = new Rectangle(l,w);
??????? ?rectangle.area();
??????? ?rectangle.perimeter();
??????? ?
??????? ?
??????? }
?}

}